// RUNNABLE_PHOBOS_TEST
import std.stdio;

/***********************************/

template cat1(T)
{
    T cat1(T i) { return i + 1; }
}

void test1()
{
    auto a = cat1(1);
    assert(a == 2);
}

/***********************************/

template cat2(T)
{
    T cat2(T* p) { return *p + 1; }
}

void test2()
{
    int i = 1;
    auto a = cat2(&i);
    assert(a == 2);
    assert(typeid(typeof(a)) == typeid(int));
}

/***********************************/

struct S3 { }

template cat3(T)
{
    T cat3(T* p, S3 s) { return *p + 1; }
}

void test3()
{
    S3 s;
    int i = 1;
    auto a = cat3(&i, s);
    assert(a == 2);
    assert(typeid(typeof(a)) == typeid(int));
}

/***********************************/

template cat4(T, int N)
{
    T cat4(T[N] p, T[N] q) { return p[0] + N; }
}

void test4()
{
    int[3] i;
    i[0] = 7;
    i[1] = 8;
    i[2] = 9;
    auto a = cat4(i, i);
    assert(a == 10);
    assert(typeid(typeof(a)) == typeid(int));
}

/***********************************/

template cat5(T, U=T*, int V=7)
{
    T cat5(T x)
    {
        U u = &x;

        return x + 3 + *u + V;
    }
}

void test5()
{
    int x = 2;

    auto a = cat5(x);
    assert(a == 14);
    assert(typeid(typeof(a)) == typeid(int));

    auto b = cat5!(int,int*,8)(x);
    assert(b == 15);
    assert(typeid(typeof(b)) == typeid(int));
}

/***********************************/

int* pureMaker() pure
{
    return [1,2,3,4].ptr + 1;
}

void testDIP29_1()
{
    int* p;
    static assert(!__traits(compiles, { immutable x = p + 3; }));
    immutable x = pureMaker() + 1;
    immutable y = pureMaker() - 1;
    immutable z = 1 + pureMaker();
}

/***********************************/

int** pureMaker2() pure
{
    int*[] da = [[11,12,13].ptr, [21,22,23].ptr, [31,32,33].ptr, [41,42,43].ptr];
    return da.ptr + 1;
}

void testDIP29_2()
{
    immutable x2 = pureMaker2() + 1;
    immutable y2 = pureMaker2() - 1;
    immutable z2 = 1 + pureMaker2();
}

/***********************************/

int[] pureMaker3a() pure
{
    return new int[4];
}

int* pureMaker3b() pure
{
    return new int[4].ptr;
}

int[4] pureMaker3c() pure
{
    int[4] buf;
    return buf;
}

void testDIP29_3()
{
    immutable x1 = pureMaker3a()[];
    immutable x2 = pureMaker3a()[0..2];

    immutable y2 = pureMaker3b()[0..2];

    // Conversion from *rvalue* of mutable static array to immutable slice
    immutable z1 = pureMaker3c()[];
    immutable z2 = pureMaker3c()[0..2];

    // Issue 12467 - conversion from lvalue of mutable static array to immutable slice
    char[3] arr = "foo";
    static assert(!__traits(compiles, { string str = arr[]; }));
}

/***********************************/

import core.vararg;

int* maker() pure { return null; }
int* maker1(int *) pure { return null; }
int* function(int *) pure makerfp1;
int* maker2(int *, ...) pure { return null; }
int* maker3(int) pure { return null; }
int* maker4(ref int) pure { return null; }
int* maker5(ref immutable int) pure { return null; }

void testDIP29_4()
{
    { immutable x = maker1(maker()); }
    { immutable x = maker1(null); }
    static assert(__traits(compiles, { immutable x = (*makerfp1)(maker()); }));
    { shared x = maker1(null); }
    { immutable x = maker2(null, 3); }
    { immutable int g; immutable x = maker2(null, 3, &g); }
    static assert(!__traits(compiles, { int g; immutable x = maker2(null, 3, &g); }));
    { immutable x = maker3(1); }
    static assert(!__traits(compiles, { int g; immutable x = maker4(g); }));
    { immutable int g; immutable x = maker5(g); }
}

/***********************************/
// 14155

immutable int g14155;

static this() { g14155 = 1; }

             int*  make14155m (             int*  p) pure { return null; }
       const(int*) make14155c (       const(int*) p) pure { return &g14155; }
   immutable(int*) make14155i (   immutable(int*) p) pure { return &g14155; }
      shared(int*) make14155sm(      shared(int*) p) pure { return null; }
shared(const int*) make14155sc(shared(const int*) p) pure { return &g14155; }

void test14155_for_testDIP29_4()
{
    static assert( __traits(compiles, {              int*  p = make14155m (null); }));  //  m <- m (normal)
    static assert( __traits(compiles, {        const(int*) p = make14155m (null); }));  //  c <- m (normal)
    static assert( __traits(compiles, {       shared(int*) p = make14155m (null); }));  // sm <- m (unique)
    static assert( __traits(compiles, { shared(const int*) p = make14155m (null); }));  // sc <- m (unique)
    static assert( __traits(compiles, {    immutable(int*) p = make14155m (null); }));  //  i <- m (unique)

    static assert(!__traits(compiles, {              int*  p = make14155c (null); }));  //  m <- c (NG) <bugzilla case>
    static assert( __traits(compiles, {        const(int*) p = make14155c (null); }));  //  c <- c (normal)
    static assert(!__traits(compiles, {       shared(int*) p = make14155c (null); }));  // sm <- c (NG)
    static assert( __traits(compiles, { shared(const int*) p = make14155c (null); }));  // sc <- c (unique or immutable global)
    static assert( __traits(compiles, {    immutable(int*) p = make14155c (null); }));  //  i <- c (unique or immutable global)

    static assert(!__traits(compiles, {              int*  p = make14155i (null); }));  //  m <- i (NG)
    static assert( __traits(compiles, {        const(int*) p = make14155i (null); }));  //  c <- i (normal)
    static assert(!__traits(compiles, {       shared(int*) p = make14155i (null); }));  // sm <- i (NG)
    static assert( __traits(compiles, { shared(const int*) p = make14155i (null); }));  // sc <- i (normal)
    static assert( __traits(compiles, {    immutable(int*) p = make14155i (null); }));  //  i <- i (normal)

    static assert( __traits(compiles, {              int*  p = make14155sm(null); }));  //  m <- sm (unique)
    static assert( __traits(compiles, {        const(int*) p = make14155sm(null); }));  //  c <- sm (unique)
    static assert( __traits(compiles, {       shared(int*) p = make14155sm(null); }));  // sm <- sm (normal)
    static assert( __traits(compiles, { shared(const int*) p = make14155sm(null); }));  // sc <- sm (normal)
    static assert( __traits(compiles, {    immutable(int*) p = make14155sm(null); }));  //  i <- sm (unique)

    static assert(!__traits(compiles, {              int*  p = make14155sc(null); }));  //  m <- sc (NG)
    static assert( __traits(compiles, {        const(int*) p = make14155sc(null); }));  //  c <- sc (unique or immutable global)
    static assert(!__traits(compiles, {       shared(int*) p = make14155sc(null); }));  // sm <- sc (NG)
    static assert( __traits(compiles, { shared(const int*) p = make14155sc(null); }));  // sc <- sc (normal)
    static assert( __traits(compiles, {    immutable(int*) p = make14155sc(null); }));  //  i <- sc

    int x;
    int* nestf() pure { return &x; }
    static assert(!__traits(compiles, { immutable(int*) ip = nestf(); }));
}

/***********************************/
// 14141

struct S14141
{
    Object obj;

    const(Object) getObj() const pure
    {
        return obj;
    }
}

void test14141()
{
    const S14141 s;
    static assert(is(typeof(s.getObj()) == const Object));           // ok
    static assert(!__traits(compiles, { Object o = s.getObj(); }));  // ok <- fails
}

/***********************************/

int[] test6(int[] a) pure @safe nothrow
{
    return a.dup;
}

/***********************************/

int*[] pureFoo() pure { return null; }


void testDIP29_5() pure
{
    { char[] s; immutable x = s.dup; }
    { immutable x = (cast(int*[])null).dup; }
    { immutable x = pureFoo(); }
    { immutable x = pureFoo().dup; }
}

/***********************************/

void testDIP29_6()
{
    /******* structs ************/

    static assert(__traits(compiles,
    {
        static struct S { int *p; }
        immutable s = new S;        // since p is null
    }));

    static assert(!__traits(compiles,
    {
        __gshared int x;
        static struct S { int *p = &x; }
        immutable s = new S;        // x is mutable
    }));

    static assert(!__traits(compiles,
    {
        int y;
        struct S { int x; void bar() { y = 3; } }
        immutable s = new S;        // nested struct
    }));

    static assert(!__traits(compiles,
    {
        static struct S { int x; this(int); }
        immutable s = new S(1);
    }));

    static assert(__traits(compiles,
    {
        static struct S { int x; this(int) pure; }
        immutable s = new S(1);
    }));

    static assert(__traits(compiles,
    {
        static struct S { int* p = void; this(int) pure; }
        immutable s = new S(1);
    }));

    static assert(!__traits(compiles,
    {
        static struct S { int* p = void; this(int*) pure; }
        int x;
        immutable s = new S(&x);
    }));

    static assert(__traits(compiles,
    {
        static struct S { int* p = void; this(immutable(int)*) pure; }
        immutable int x;
        immutable s = new S(&x);
    }));

    static assert(__traits(compiles,
    {
        static struct S { int* p = void; this(int*) pure; }
        immutable s = new S(null);
    }));

    /******* classes ************/

    static assert(__traits(compiles,
    {
        static class S { int *p; }
        immutable s = new S;        // since p is null
    }));

    static assert(!__traits(compiles,
    {
        __gshared int x;
        static class S { int *p = &x; }
        immutable s = new S;        // x is mutable
    }));

    static assert(!__traits(compiles,
    {
        int y;
        class S { int x; void bar() { y = 3; } }
        immutable s = new S;        // nested class
    }));

    static assert(!__traits(compiles,
    {
        static class S { int x; this(int); }
        immutable s = new S(1);
    }));

    static assert(__traits(compiles,
    {
        static class S { int x; this(int) pure; }
        immutable s = new S(1);
    }));

    static assert(__traits(compiles,
    {
        static class S { int* p = void; this(int) pure; }
        immutable s = new S(1);
    }));

    static assert(!__traits(compiles,
    {
        static class S { int* p = void; this(int*) pure; }
        int x;
        immutable s = new S(&x);
    }));

    static assert(__traits(compiles,
    {
        static class S { int* p = void; this(immutable(int)*) pure; }
        immutable int x;
        immutable s = new S(&x);
    }));

    static assert(__traits(compiles,
    {
        static class S { int* p = void; this(int*) pure; }
        immutable s = new S(null);
    }));
}

// 14155

void test14155_for_testDIP29_6()
{
    static class CI
    {
        int* p;
        this(int) immutable pure { p = &g14155; }
    }

    static assert(!__traits(compiles, {           CI c = new immutable CI(1); }));
    static assert( __traits(compiles, {     const CI c = new immutable CI(1); }));
    static assert( __traits(compiles, { immutable CI c = new immutable CI(1); }));
    static assert(!__traits(compiles, {    shared CI c = new immutable CI(1); }));
    static assert(!__traits(compiles, {           CI c = new     const CI(1); }));
    static assert( __traits(compiles, {     const CI c = new     const CI(1); }));
    static assert( __traits(compiles, { immutable CI c = new     const CI(1); }));
    static assert(!__traits(compiles, {    shared CI c = new     const CI(1); }));
}

/***********************************/
// 13640

struct S13640
{
    static struct R
    {
        int* p;
        this(inout ref int* p) inout pure { this.p = p; }
    }

    int* p;

    void foo() inout pure
    {
        // Implicit conversion from inout(R) to R should be disallowed.
        static assert(!__traits(compiles, { R r = inout(R)(p); }));
    }
}

/***********************************/
// 15778

void test15778()
{
     char[] cs = new  char[](3);
    wchar[] ws = new wchar[](3);
    dchar[] ds = new dchar[](3);

    cs[] = "abc";   assert(cs == "abc");
    cs[] = "def"c;  assert(cs == "def");
    ws[] = "abc";   assert(ws == "abc");
    ws[] = "def"w;  assert(ws == "def");
    ds[] = "abc";   assert(ds == "abc");
    ds[] = "def"d;  assert(ds == "def");

    static assert(!__traits(compiles, (cs[] = "a"w)));
    static assert(!__traits(compiles, (cs[] = "a"d)));
    static assert(!__traits(compiles, (ws[] = "a"c)));
    static assert(!__traits(compiles, (ws[] = "a"d)));
    static assert(!__traits(compiles, (ds[] = "a"c)));
    static assert(!__traits(compiles, (ds[] = "a"w)));
}

/***********************************/

void main()
{
    test1();
    test2();
    test3();
    test4();
    test5();
    testDIP29_1();
    testDIP29_2();
    testDIP29_3();
    testDIP29_4();
    testDIP29_5();
    testDIP29_6();
    test15778();

    writefln("Success");
}